题目内容
7．The blue planet is so far from the earth that radio signals，traveling the speed of light，take 16hours to reach the spacecraft．（ ）| A． | for | B． | on | C． | at | D． | in |
分析 这个蓝色星球距离地球如此遥远以至于无线电信号，以光速前进，到达宇宙飞船需要16个小时．
解答 答案：C．
结合语境可以推断这句话表达的意思是"蓝色星球距离地球如此遥远以至于无线电信号，以光速前进，到达宇宙飞船需要16个小时．"，所以设空处的介词短语表达的意思是"以…速度行驶"，应该用介词at，故选C
点评 了解每个介词的含义是做好此类题型的关键，还要从句意着手，根据句意作出解答；所以，平时的学习中要多进行积累词汇，才能很好的完成．
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